Which is better firewood oak fir or willow?

When comparing firewood, oak is generally considered the best option due to its high density and long burn time, producing more heat and less smoke. Fir burns faster and is easier to ignite, making it suitable for kindling, but it generates less heat overall. Willow, on the other hand, is relatively low in heat output and burns quickly, making it less desirable for long-lasting fires. For optimal performance, oak is the preferred choice among these three.